字符串编码之间的转换（GB2312<->UTF8<->Unicode）及URLEncoding

LPWSTR GB2312ToUnicode(LPCSTR lpszInBuf){if (NULL == lpszInBuf){return NULL;}WCHAR* pBuf = NULL;int nLen = MultiByteToWideChar(CP_ACP, 0, lpszInBuf, -1, pBuf, 0);pBuf = new WCHAR[nLen];memset(pBuf, 0, sizeof(WCHAR) * nLen);MultiByteToWideChar(CP_ACP, 0, lpszInBuf, -1, pBuf, nLen);return pBuf;}LPSTR UnicodeToGB2312(LPCWSTR lpszInBuf){if (NULL == lpszInBuf){return NULL;}CHAR* pBuf = NULL;int nLen = WideCharToMultiByte(CP_ACP, 0, lpszInBuf, -1, pBuf, 0, NULL, NULL);pBuf = new CHAR[nLen];memset(pBuf, 0, sizeof(CHAR) * nLen);WideCharToMultiByte(CP_ACP, 0, lpszInBuf, -1, pBuf, nLen, NULL, NULL);return pBuf;}LPWSTR UTF8ToUnicode(LPCSTR lpszInBuf){if (NULL == lpszInBuf){return NULL;}WCHAR* pBuf = NULL;int nLen = MultiByteToWideChar(CP_UTF8, 0, lpszInBuf, -1, pBuf, 0);pBuf = new WCHAR[nLen];memset(pBuf, 0, sizeof(WCHAR) * nLen);MultiByteToWideChar(CP_UTF8, 0, lpszInBuf, -1, pBuf, nLen);return pBuf;}LPSTR UnicodeToUTF8(LPCWSTR lpszInBuf){if (NULL == lpszInBuf){return NULL;}CHAR* pBuf = NULL;int nLen = WideCharToMultiByte(CP_UTF8, 0, lpszInBuf, -1, pBuf, 0, NULL, NULL);pBuf = new CHAR[nLen];memset(pBuf, 0, sizeof(CHAR) * nLen);WideCharToMultiByte(CP_UTF8, 0, lpszInBuf, -1, pBuf, nLen, NULL, NULL);return pBuf;}LPSTR GB2312ToUTF8(LPCSTR lpszInBuf){if (NULL == lpszInBuf){return NULL;}LPWSTR lpszTmp = GB2312ToUnicode(lpszInBuf);LPSTR lpszBuf = UnicodeToUTF8(lpszTmp);delete[] lpszTmp;lpszTmp = NULL;return lpszBuf;}LPSTR UTF8ToGB2312(LPCSTR lpszInBuf){if (NULL == lpszInBuf){return NULL;}LPWSTR lpszTmp = UTF8ToUnicode(lpszInBuf);LPSTR lpszBuf = UnicodeToGB2312(lpszTmp);delete[] lpszTmp;lpszTmp = NULL;return lpszBuf;}LPSTR GB2312Encoding(LPCSTR lpszInBuf){if (NULL == lpszInBuf){return NULL;}const int nLen = strlen(lpszInBuf) * 3 + 1;CHAR* pBuf = new CHAR[nLen];memset(pBuf, 0, sizeof(CHAR) * nLen);CHAR szTmp[4] = { 0 };for (int i = 0; i != strlen(lpszInBuf); ++i){if (IsDBCSLeadByte(lpszInBuf[i])){sprintf_s(szTmp, _countof(szTmp), "%%%02X", lpszInBuf[i] & 0xFF);}else{sprintf_s(szTmp, _countof(szTmp), "%c", lpszInBuf[i]);}sprintf_s(pBuf + strlen(pBuf), nLen - strlen(pBuf), "%s", szTmp);}return pBuf;}LPSTR UTF8Encoding(LPCSTR lpszInBuf){if (NULL == lpszInBuf){return NULL;}CHAR* pBuffer = GB2312ToUTF8(lpszInBuf);const int nLen = strlen(pBuffer) * 3 + 1;CHAR* pBuf = new CHAR[nLen];memset(pBuf, 0, sizeof(CHAR) * nLen);CHAR szTmp[4] = { 0 };for (int i = 0; i != strlen(pBuffer); ++i){if (IsDBCSLeadByte(pBuffer[i])){sprintf_s(szTmp, _countof(szTmp), "%%%02X", pBuffer[i] & 0xFF);}else{sprintf_s(szTmp, _countof(szTmp), "%c", pBuffer[i]);}sprintf_s(pBuf + strlen(pBuf), nLen - strlen(pBuf), "%s", szTmp);}if (NULL != pBuffer) { delete[] pBuffer; pBuffer = NULL; }return pBuf;}int main(){CHAR szText[] = "百度Hi";CHAR* pBuf = UTF8Encoding(szText);MessageBoxA(NULL, pBuf, NULL, 0);delete[] pBuf;pBuf = NULL;    return 0;}